Apparatus for controlling the coating of paper



Dec. 19, 1944. R. w. BENDl-:R

APPARATS FOR CONTROLLING THE COATING OF PAPER Filed Aug. 5, 1940 '3 Sheets-Sheet l Dec. 19, 1944. v R,'w BNDER APrARATus Fon coNTRoLLING THE comme oF PAPER 5 Sheets-Sheet 2 Filed Aug; 5, @1940 INVENTOR Eb W e/lder.'

TTR?! i Dc. 19, .1944. R. w. BENDER APPARATUS FVOR CONTRLLING THE COATING'OF PAPER 3 Sheets-Sheet Filed Aug. 3, 1940 S@ @5&2 l l .,gxm mxb* ATTORNEY Patented'Dcc. 19, 1944 UNITED 4s'm'rlzs PA'reN'rv OFFICE APPARATUS FOR CONTROLLING THE COATIN G F PAPER Robert W. Bender, Kansas City, Mo., assigner to Waxide Paper Company, Kansas City, Mo., a corporation of Missouri Application August 3, 1940, semi No. 350,851

(ci. eil-31) 5 Claims.

dium applied to the paper be evenly spread over the entire surface of the paper and sometimes uniformly impregnatedinto the paper and that such coating medium be of a predetermined uniform quantity. This is for the reason that paper, for instance, is coated for a number oi very denite purposes, in each of which it is usually customary for thev manufacturer to sell his product by the pound to a user whose requirements are measured in area. For this' reason it has become customary for the manufacturer to sell his coated productlwith strict guarantees on the percentages of coating to nnlished product weights, and variations resulting from present ineicient means of regulating the quantities of coating 4materials that are applied have resulted in a great deal of unnecessary expense to both the manufacturers and the consumers. Y

As an example, where papers are coated with' wax to be used for an outer wrap for food items it has been found that a dennite minimum quanf tity of wax on the surfaces of the paper, not only protects the wrapped item from loss of moisture through the wrappenbut is an excellent sealing medium when subjected to a certain amount of heat and pressure fora certain length of time.

In conventional processes, due to the impossibility of present equipment to maintain a uniformly minimum application oi the coating material, the 'manufacturer is compelled to iurnish sufiicient wax on his entire product so that with a maximum variation of his coating it will still all have sumcient material applied to effect a proper seal in the est place.

Other objects of the present invention are, therefore, to accurately regulate predetermined quantities of coating materials by the application of uid pressure to rolls between which the coating medium is metered on and to sheets where it is desired that all oi the coating material be entirely impregnated in the sheet from either side or from both sides; where it is desired to impregnate the sheet and leave a coat- 'ing on one side only; to coat a sheet on one side only; to coat a sheet with a predetermined quantity of coating material on one side, and a diiferent predetermined quantity on the opposite side of the sheet; to'provide an improved pressure roller; to provide a lubricating arrangement for the bearings of the rollers; to provide for adjusting the rollers relative to each other; to pro vide for dissipating or relieving pressure from 'the rollers; to provide improved elements in the apparatus, together with novel arrangements of such elements, in an` apparatus of the character and for the lpurpc'l'ses noted.

In accomplishing these and other objects of the present invention I have provided improved details of structure, preferred forms and arrangements oi apparatus by' which various applications of coatings may be carried out being illustrated in the accompanying drawings where- Fig. 1 is a diagrammatic view of an apparatus embodying the present invention and showing the application ofl treating medium to both sides of sheet stock such as papera Fig. 2 is a side elevational view of hydraulically controlled pressure rollers, parts thereof being `shown in vertical section to more clearly illustrate the construction thereof.

Fig. 3 is a vdetail verticalcross-sectional view of a pressure regulator for, controlling and maintaining hydraulic pressure applied to the pressure rollers.

Fig. 4 is a detail vertical cross-section through 4 the pressure rollers shown in Fig. 2 substantially v ticularly illustrating the on the line l-d Fig. 2, and particularly illustrat lng the bearings and pressure `regulating devices therefor.

Fig. 5 is a detail vertical cross-section through the pressure rollers on the line t-ii, Fig. 2, parering for one ci the t s.

arrangement ci a covshowing the application of treating medium to,

one side of the sheet stock and the bonding of the treated sheet with another sheet to forma laminated sheet structure.

Referring more in detail to the drawings:

I, Fig. 1, designates a roll of suitable sheet' stock such as paper, for example, which may,

y, if desired, `be printed, wetted, tempered, and/or precalendered previous to the treatment as presently described.

The roll of sheet stock is arranged on a suitable support indicated by dotted lines at 2, on which support may also be arranged a series of rollers 3. 4, and 5 over, under and over which, respectively, the stock may travel.

6 designates-antank in which fluid 1 is carried for treating the stock, as it travels therethrough, as by passing under a roller 8, over a roller 8 and under a roller I0 arranged in and/or adjacent the tank 6. The iluid 'I may be a suitable material such as melted wax or paramn, or lacquer, synthetic resin, glucose or other adhesives, or any other suitable material which may be emand/ or coating the entire surface thereof, or one side thereof.

From the coating material bath 1, the stock I is preferably passed between pressure rollers II and I2, and then, if wax is used as coating material, preferably over, under and over guide or polishing rollers I3, I4, and I5, respectively, into a tank I6 that contains a 'wax solidifying solution I1, such as chilled water. If lacquer or the like is used .as a coating material the stock may govdirectly to smoothing or guide rolls for rewinding on a storage roll.

In the present instance, stock I may be passed under a suitable number of rollers I8, I9 and 20,

in the tank I6, after which it may be directed from the tank I6 to smoothing or guide rollers for rewinding on a storage roll, not shown.

As thestock I passes between the rollers II and I2 those rollers are arranged to meter the treating material and squeeze off excess material to cause such material to drain backinto the body of the coating solution. At this stage of the process, accuracydn providing a constant pressure is important for reasons above pointed ou In order to obtain the requisite accuracy in application ot constant pressure to meter or squeeze on excess in amounts of treating or coating material and leave exact predetermined Aquantities of coating material in, and/or on the paper stock and as a coating on the paper stock, the rollers II and I2, Fig. 1, are preferably supported, arranged.. and operated relative to each other in the following manner:

42l and 22, Fig. 2, designatesuitable primary supports, such as angle iron sills on each oi'l which substantially duplicate aligned blocks 23, Flg. 4, are respectively mounted.

The blocks 23 each have spaced, vertically arranged apertures for receiving fastening devices, such as the bolts 24, 25, 26 and 21. Each block 23 is also 'provided with an aperture 28 arranged substantially centrally relative to a cut-out bearing seat 28 on the upper face of the-block.

30 designates the lower half of a bearing having lateral iianges'seating on the upper face of ployed for impregnating the ilbres of the stockl each block and having a body portion 3| dependt ing-into the seat 26 and from which a lubricant outlet 32 depends, the outlet 32 extending downwardly through the aperture 28 in each block and sill, for suitable disposition of lubricant issuing from the outlet. i y

33 designates the upper half of the bearing 38,. which upper bearing portion has ilanges mating with the ilanges of the lower bearing portion in such a manner that the fastening devices 26 and 21 may secure the same' together.

Trunnions 34 and 35, Fig. 2, of the roller II are mounted in bushings 36, arranged in the bearings 38-33. It has been found preferable to form the roller I I of polished chilled iron and the roller is also preferably of substantially hollow structure as shown. v

38, Fig. 4, designates one of a duplicate pair of standards each having diverging legs 39 and 40 'which form a yoke adapted vto straddle the bearing 30-33 in such a manner that the bases 4I of the legs seat on the blocks 23.l

The legs 4I have depending flanges 42 on their outerl lower ends provided with apertures for receiving fastening devices, such as set screws, 43, by which the standards 38 are held in desired position relative to the bearings for the roller II. The bases of the legs are also provided with apertures by which the fastening devices 24 and 25 may hold the standards 38 relative to the sills supporting them.

Th'e standards each comprise spaced channels 44 and 45 that form a guide 46 therebetween for a bearing element consisting of upper and lower bearing portions 41 and 48 which have cooperative bearing seats that receive a cylindrical bushing 49 in which trunnions 50 at each end of the roller I2 are mounted. The lower bearing portion 48 of the bearing in each standard 38 rests on the upper end of a spring 5I, preferably of considerably greater power than is required to lift the roller I2. The lower end of the springA A lubricant outlet 54 is mounted in a bore in the screw 52 and communicates with the bearing 41-48 in such a manner as to drain 'oif lubricant of that bearing and transfer it through an opening 55 in the bearing member 33 to each trunnion of the roller II for ultimate exhaust through the outlets 32. The upper half of each bearing 41-48 has a lubricant inlet 56 which communicates with the bearing seats to supply lubricant to the trunnions of the roller I2.

It has been found highly desirable to apply fluid, such as hydraulic, pressure on the roller I2relative to the roller II, in order to provide constant and uniform pressures. A piston cylinder 51 is thus preferably mounted in each guide 48 of the standards 38, the piston cylinders having a piston 58 therein, which piston has a rod 58 engageable in the present instance, with the upper face of the upper portion of the bearing 41-48. The piston cylinders may be suitably closed at their lower ends, as at 60.

6I designates a cap structure for each standard engaged with the upper ends ofl the arms Aof the standards 38, as by fastening devices 62, the ca p members forming a support against upward movement of the piston cylinders 51, which may relative to the rollthis invention,

, v vmeedoen piston' cylinders i1 above the pistons I8 forv applying hydraulic pressure to the pistons to exert downward pressure on the trunnlons of sure of the springs II into engagement the I upper-portion of the bearing 41-48 to causes.

the roller l2 relative to the roller II to meter material passing between the rollers and squeeze .anylexcess in treating medium from the stock I as it passes between the rollers. a a

- A pressure gauge 65 'is mounted-in the line M adjacent the piston cylinder ofeach.l standard, and a,bleederline 81 opens from .the line on the piston cylinder side of a pressure regulator 61 that'is interposed between each pistonv cylinder` and a valve 08 that controls admis' sion of iluid pressure medium from a pump I9 into theline M.

` The pressure regulators 61 are each of suituniform constant pressure on opposite ends of the roller I2 relative to roller II. the uniformity of constant pressure being, determined and maintained by thel regulators. The bleeders Il use flow through lthe line to keep the regulators in operation. f

As it becomes necessary, lubricant may be 4 applied to the lubricant inlets 50 of the bearings 41-48 which lubricant passes to the lower roller v bearing portions through the outlet 6I into the bearings 30-33 forv the lower roller II, and from the lower roller bearingsy through the outlets] able"construction and for example of the type illustrated in Fig. 3 in which' an inlet line 10 opens into a high pressure area 1I, the iluid pressure medium entering a port 12 andpassing through a port 13 into a lowv pressure area 14. The size of the port 13 iscontrolled by a valve If seating engaged with a diaphragm 11 which acts against \a spring 'I8 that may be adjusted in'a suitable manner as indicated at 19.

Fluid pressure medium issues from the resu- 4 the outlet line B3 with the line 64 by turningv the valve tol communicate the port 84 with line N to relieve the pistons, cylinders and roller I2 of pressure.

. The pump 69 may be of suitablev type and a source of fluidv supply, not shown. may bepro- 2Avided for 'the punp, together with -a' sump, not. "shown, forv receiving and/or circulating fluid pressure medium from the line M throughthe 'outlet 83 and if'v desired back to the pump. v f v While the amount ot treating material to be l -applied to the sheet stock may be very accurately predetermined and the squeezing orV metering. action of the roller I2 relative to the roller Il may also be very accurately predetermined, the

treated paper'. may-,be `relatively large and `in' order to avoid injuring the stock -ithas been found desirable to coat the roller I2 with a rub- I beror similar cover `I1. v

l In operating the apparatus forfcarrying out pressure regulators l1, the adjustments of which,

when pressure" fluid medium is passed. th'eife-- through, beingindicatedon the gauges when, therefore,

' -treating'bath'ior coating and/or impregnating the stock and then to and between the rollers onfa spring 16 and havinga stem adiustmentsfare made to allowv spacing the rollers. relativev .to each other by "xn-muuu the adjusting devices '1. on the "f2/winding or storage facilities. not shown.

` In F18. 7, 99 desi'ntes a'roll of Sheet Stock sheet" stock is applied to ,the

' out this invention in connection with additional 'le stock.

2l for suitable disposition.

After a'sheet oi stock has beentreated and` squeezed in the manner'described, valve 68 may j, 'be turned to relieve pressure on the rollers, whereupon the springs 5I act to separate the rollers to2 provide for inserting another sheet of coated, treated paper between the rollers for carrying mrtg. s, d sheet stock v88 may be1 treated on both sides as .by the apparatus shown in Fig. `1, one side of 1 the stock being providediwith an additional .coatl' ing or treatment. I f

In this instance, the stock is preferably between rollers Stand 80, the rller `its being partly immersed in a bath 9i of 'suitable treating material in auch a manner as to apply a coating of material to one side or the stock.. The

rollers 88 and 90 are similar in character to theyrollers II and I2 shown in Fig. 2, are operated f and controlled by' fluid pressure and meter the treating material relative to the treated stock to coat yand/or impregnate the tock with predetermined quantities oi treati `rollers 92 and Sl. The rollers 82 and Si'are similar to the rollers I'I-I2 and .89-80 in con- Y struction, `operation and function, and are adjusted relative to the stock passing Atherethrough in such` a manner as to provide `for coating and/or impregnating the stock ,with [a diiierent amount of material fromthe` rollers Stto vary 'the amount oi material-in or .on opposite sides of the stock.-

The roller' s2. in aus instance', is arranged f the treating material bath 8i for. y

to depend into Ypicking up material vand applying. it to one side vcmistant predetermined pressures applied to the.`

oi the stock 88 to provide a thick coating there on or impregnation therein depending upon the treated stock by iiuid pressure applied to the i controlo! yrelative pressure between the rollers.

II and Il io'r. metering or controlling the amount of material. retained in and on the paper, the pump isfactuated and iluld pressure medium -passes into the v 1 From the rollers 92 and 83, the

over polishing or guide Y 'a suitable treating medium bath- 91, yauch asv rollersr Ibi rollers 3l,

chilled water, for hardeningvor finishing the treatmentcf the sheet stock.

Vstock/may Kthen be directed, asat 08, toward to be treatedwitn suitable material' loo. preferfrom the roll to and between hydraulically operated and controlled pending into the supply of treating materialto pick up the same and apply it to the sheet stock: the application of hydraulic pressure to the rollers and material treated stdcir Yproviding for imetering the material on and into-'the-stock to boat and/or impregnato the stock withmaterial an'apparatus is shown by whit-:lil

stock may Dass and 8B intov and |02, the former preferably deto a degree depending upon relative hydraulically controlled pressures between the rollers.

If desired, the sheet stock 99, when coated on one side, may be employed to engage another sheet |03 to form a laminated sheet structure H14, substantially in the manner shown, which may be wound and stored forf'iture suitable use.

It is apparent, therefore, that by providing a fluid control, to eect constant pressure in the manner described, a uniform treating, impregnating and/or coating medium of any suitable material is applied to sheet stock such as paper in which the body, one side, or the entire surface is treated, covered, or impregnated with a -desired amount of material for many purposes.

It is also apparent that a convenient, relatively economical and highly eflicient apparatus for treating sheet stock with suitable material is provided by thepresent invention.

What I claim and desire to secure by Letters Patent is:

1. In an apparatus of the character described comprising means for, applying a Wax coating to paper stock, a pair of rollers adapted to have the wax coated stock passed therebetween, and means for applying hydraulic pressure to one of said rollers relative to the other for forcing wax into the fibres of thepaper and for metering the coating of the wax on said stock including a pair of standards, aligned bearings in said standards supporting the ends of said rollers, and means interposed between said bearings for normally resiliently separating the same.

2. In an apparatus of the character described, a pair of rollers, and means for applying hydraulic pressure to one of said rollers relative to the other including a pair of standards, aligned bearings in said standards supporting the ends of said rollers, means interposed between said bearings for normally resiliently separating the same, piston cylinders mounted on said standards having pistons engageable with the ends of one of said rollers for exerting forces against said roller of greater strength than the resilient means in the direction of the other roller, fluid pressure lines leading to said cylinders, and means for feeding said fluid pressure lines.

3. In an apparatus of the character described comprising means for applying a coating and/or impregnating medium to paper, a pair of rollers adapted to have the coated paper passed therebetween, and means for applying pressure to one of said rollers relative to the other for xing predetermined portions of the coating medium in and on said coated paper lincluding a pair of standards, aligned bearings in said standards supporting the ends of said rollers, piston cylinders mounted on said standards for vexerting forces against said roller in the direction of the other roller, a fluid pressure line leading to said cylinders, means for feeding said uid pressure line with sulcient pressure medium to exert suitable forces and a pressure regulator in said line between the feed line and piston cylinders.

4. In an apparatus of the character described comprising means for applying a coating and/or impregnating medium to paper, a pair of rollers adapted to have the coated paper passed therebetween, and means for applying pressure to one of said rollers relative to the other for xing predetermined portions of the coating medium in and on said coated paper including a pair of standards, aligned bearings in said standards supporting the ends of said rollers, piston cylinders mounted on said standards having pistons engageable with the ends of one of said rollers for exerting forces against said roller in the direction of the other roller, a fluid pressure lineV leading to said cylinders, means for feeding said fluid pressure line, with suflcient pressure medium to exert suitable forces, and a valve for controlling supply and exhaust from said line relative to said line feeding means.

5. An apparatus of the character described comprising means for applying a coating and/or impregnating medium tov paper including a pair of rollers adapted to have the paper passed therebetween, means for applying pressure to one of said rollers relative to the other for fixing predetermined portions of the coating medium in and on said paper including a pair of standards, aligned bearings in said standards supporting the ends of said rollers, piston cylinders mounted on said standards having pistons engageable with the ends of one of said rollers for exerting forces against said roller in the direction of the other roller, a fluid pressure line leading to said cylinders, means for feeding said fluid pressure line i with sufficient .pressure medium to exert suitable forces, and a valve for controlling supply and exhaust from said line relative to said'line feeding means.

ROBERT W. BENDER. 

